I am experiencing a similar problem. When I First bought the device it did not show up, and then it did and now it is not showing up again. I did what was recommended for the other individual to do and here is my output:

Jul 8 18:46:30 gtwhitegold kernel: usb 1-1: device not accepting address 18, error -110
Jul 8 18:46:30 gtwhitegold kernel: usb 1-1: new high speed USB device using ehci_hcd and address 19
Jul 8 18:46:41 gtwhitegold kernel: usb 1-1: device not accepting address 19, error -110
Jul 8 18:46:41 gtwhitegold kernel: usb 1-1: new high speed USB device using ehci_hcd and address 20
Jul 8 18:46:51 gtwhitegold kernel: usb 1-1: device not accepting address 20, error -110

I plugged it in several times and every time the device stated that it would not accept the assigned address.
Any help is appreciated.

Thanks,
Allen